Actually I put up then edited away a suggestion of burying the speaker face up in the ground as I know McIntosh used to do for two reasons.
1) It's not done in your parking lot example.
2) It's not salient; so bringing up a tangent rather then staying on topic would be done by... I'd guess a troll.
Burying in the ground is going to decrease the apparent volume of the tweeter as it loses the reflection of the ground (this is as opposed to a real room).
It will also raise the volume of the woofer as opposed to an anechoic chamber (you remember: we were talking about those before you attempted to redirect my perfectly accurate point (complete with pictures) by implying I was a troll).
Anechoics don't measure the half-space result. Buried in the ground does. In a room is like neither. They are three different measurements.
The objects which will reflect (the ground in outdoors testing and "nothing" in an anechoic chamber) are different; so no amount of opinion that they are the same will change the basic physics you are so blithely ignoring.
I guess some people are more interested in appearing right than learning and becoming right.